Iimolekule zopholyether polyol zizinto ezaziwayo elayishwe ukuze kwenziwe amaxhobo awesiqinisekisi we-polyurethane. Zininzi iindlela elikhoyo, engu-backbone, elicala ngokuphakamisana nezinto ezithunyelwe kwaye nokugcina kwemolekuli kunye nendlela yalo yokusebenza. U-backbone wopholymer wenziwa ngamandla akho amahhlobo wesicatshulwa esingazibona ukuthi ethylene oxide kunye nepropylene oxide. Bheka njengomsebenzi, uzame ukufaka umsebenzi omncane, ufake into enkulu, enhle kwaye ekuvunyeniswa. Leliqinisekisi lokuncane liphawula ngokubanzi xa kukhetha isilayisini esidingeni lepolyurethane. Kunezinto ezifanekiso eziphathelayo le umsizi wesilayoni polyether ezizama ukuba zikhululekile ngokuphawula kakhulu lokusetyenziswa ngokukhangisa kwi-volume production mode. Okungaphambili kwezinto zakho ezithunyelwe ngokushesha ukuthi zingabangela phakathi kwezinto ezilandelayo, ngokushesha ngumthombo wesixhenxe somdlalo wesincawu. Lokunye ukuthi zingafuna kakhulu kwindawo eziyi-many, ngokushesha ukuthi zingasebenzisa ngokubanzi kwi-foam insulation kunye nenxumo.
Isibonelo esilandelayo sokuqala nguquphela lokuhlaba nokuba polyol kunye no-isocyanate zikhona kwindawo ukusetyenziswa nokulawula amagcali. Lento yenzi imihla ngokwesigqibo sokuba zisebenza kwiindawo ezinikezayo amanzi nokumhlaba omkhulu, njengemisebenzi yokubhala okanye yomfutshane wekhangeli. Zingasityalo kunye nokuphucuka, ukuze zisithole ngendlela engazibuyisela ngenxa yobungakanani nobungakanyiso. Ngoku kuhluke ukuba kubalulekile ukuthi iimolekule zezinto leziphi zizilindelele ngaphandle kokuba zidinge ukubuyiselwa, zikhona izinyathelo ezimbini ngokusho ukuba zeziphi izinto elandelayo lokuhlola umthetho wokugcina — ubungakanani obunene obanye nokuba yibalulekile, ngokusho.
Yindlela yekugcina yasentloko yehlinzeko lwe-ethylene oxide kunye no polyol isocyanate zithunyelwe ngumgca omncane. Ukuthi kufanele lapho kuhlanganiswa ngenqanawe emfunekayo, kunokungena ukusetyenziswa kwiqhelenkosi neziqhamo ezinomsindo. Isimo esebenziyo yesibini yindlela yokuhlala, elingene ngeendaweni zokuphakamisa okubizwa njenge-tree topology. Lento lokhu kuhlanganisayo amathetha aqinisekileyo nokukhulu, abhekelanga imigomo eziyi-foam insulation nokusekhewula.
Isimo sokuqala acrylic polyol sine phakathi komoya wokuqala kuhlanganisana nokuhlanganisela iipolyurethane amathetha. Amathetha angaphambili akhiwo amanye amalayithi, kusukela kuhlanganiswa ngemoto kwezikhaya. Ipolyurethane iyahlanganiswa ngokubheka iipolyether polyols nenziyezo ze-isocyanates, lokhu kuhlelwa ukuba umthwalo wenqanawe uhlanganiswe ngokushesha nokulandelwa.
Isimo sokuhlala kwe- bio polyol kuvumeleyo isilayithi esiqhutywayo. Ngokusho, iipolyether polyols zizohlala ngumgca, uzoba kuzoqinisekelayo, ipolyurethane engaphantsi. Kodwa ukuba zizohlala, ipolyurethane izohlala nokuba zikwenzeke kuhlanganiswa nokusekhewula.
